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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.server.locksettings.recoverablekeystore;
     18 
     19 import java.io.IOException;
     20 import java.security.cert.CertificateException;
     21 import java.security.Key;
     22 import java.security.KeyStore;
     23 import java.security.KeyStoreException;
     24 import java.security.NoSuchAlgorithmException;
     25 import java.security.NoSuchAlgorithmException;
     26 import java.security.UnrecoverableKeyException;
     27 
     28 /**
     29  * Implementation of {@link KeyStoreProxy} that delegates all method calls to the {@link KeyStore}.
     30  */
     31 public class KeyStoreProxyImpl implements KeyStoreProxy {
     32 
     33     private static final String ANDROID_KEY_STORE_PROVIDER = "AndroidKeyStore";
     34     private final KeyStore mKeyStore;
     35 
     36     /**
     37      * A new instance, delegating to {@code keyStore}.
     38      */
     39     public KeyStoreProxyImpl(KeyStore keyStore) {
     40         mKeyStore = keyStore;
     41     }
     42 
     43     @Override
     44     public boolean containsAlias(String alias) throws KeyStoreException {
     45         return mKeyStore.containsAlias(alias);
     46     }
     47 
     48     @Override
     49     public Key getKey(String alias, char[] password)
     50             throws KeyStoreException, NoSuchAlgorithmException, UnrecoverableKeyException {
     51         return mKeyStore.getKey(alias, password);
     52     }
     53 
     54     @Override
     55     public void setEntry(String alias, KeyStore.Entry entry, KeyStore.ProtectionParameter protParam)
     56             throws KeyStoreException {
     57         mKeyStore.setEntry(alias, entry, protParam);
     58     }
     59 
     60     @Override
     61     public void deleteEntry(String alias) throws KeyStoreException {
     62         mKeyStore.deleteEntry(alias);
     63     }
     64 
     65     /**
     66      * Returns AndroidKeyStore-provided {@link KeyStore}, having already invoked
     67      * {@link KeyStore#load(KeyStore.LoadStoreParameter)}.
     68      *
     69      * @throws KeyStoreException if there was a problem getting or initializing the key store.
     70      */
     71     public static KeyStore getAndLoadAndroidKeyStore() throws KeyStoreException {
     72         KeyStore keyStore = KeyStore.getInstance(ANDROID_KEY_STORE_PROVIDER);
     73         try {
     74             keyStore.load(/*param=*/ null);
     75         } catch (CertificateException | IOException | NoSuchAlgorithmException e) {
     76             // Should never happen.
     77             throw new KeyStoreException("Unable to load keystore.", e);
     78         }
     79         return keyStore;
     80     }
     81 }
     82